Mayor London Breed (center) and Salesforce CEO Marc Benioff (center, right) listen to a speech at the Healthy Oceans Climate Reception at Salesforce East on Mission Street in San Francisco, California, on Thursday, Sept. 13, 2018. Benioff and Breed were initially on opposite sides of the Proposition C debate, but Breed now supports the initiative, which collects a tax from technology companies like Salesforce to pay for programs to support the homeless. Benioff actively campaigned in support of the bill.

Mayor London Breed (center) and Salesforce CEO Marc Benioff (center, right) listen to a speech at the Healthy Oceans Climate Reception at Salesforce East on Mission Street in San Francisco, California, on

Mayor London Breed (center) and Salesforce CEO Marc Benioff (center, right) listen to a speech at the Healthy Oceans Climate Reception at Salesforce East on Mission Street in San Francisco, California, on Thursday, Sept. 13, 2018. Benioff and Breed were initially on opposite sides of the Proposition C debate, but Breed now supports the initiative, which collects a tax from technology companies like Salesforce to pay for programs to support the homeless. Benioff actively campaigned in support of the bill.

Mayor London Breed (center) and Salesforce CEO Marc Benioff (center, right) listen to a speech at the Healthy Oceans Climate Reception at Salesforce East on Mission Street in San Francisco, California, on

Tech giant Salesforce and delivery service Postmates have agreed to let San Francisco keep money collected from them under Proposition C, a ballot measure to fund homeless services that’s being challenged in court.

Under the deal, the city would be able to keep the money even if the measure is struck down.

Mayor London Breed is expected on Wednesday to announce the agreements, which were made possible by legislation passed by the Board of Supervisors allowing companies to voluntarily waive their possible future right to refunds on Prop. C fees in exchange for a 10% tax break.

Prop. C levies a gross receipts tax of about 0.5% on corporate revenue above $50 million. As many as 400 companies in San Francisco are subject to the tax, and it’s expected to raise as much as $300 million annually for homeless housing and services. San Francisco voters passed Prop. C by more than 61% in November, but it’s being challenged in court over the margin of victory, which some say should be two-thirds.

Breed was an opponent of Prop. C but has since worked to make the funds available despite the lawsuit. She and Supervisor Vallie Brown wrote the legislation.

The city is collecting Prop. C money, but it’s being held in reserve until the outcome of the court fight. If the measure is ruled invalid, the city will have to refund the money.

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“We know we have too many people suffering on our streets, including people with severe mental health and substance use issues,” Breed said in a statement thanking Salesforce and Postmates for their actions. “With these resources, we can use targeted investments to get the care, shelter, and housing that people in our City need.”

The combined Prop. C tax payments from Salesforce and Postmates is estimated at $14 million. The money would become available in February.

The waiver agreement by Salesforce and Postmates is for one year and would have to be renewed each year. City officials have laid out a plan to use the new money, and it includes spending $1.4 million on new shelter beds, $6 million for supportive housing and $3.4 million on residential treatment beds for homeless people with behavioral health issues.

“We need more San Francisco companies to step up and participate in Mayor Breed’s Prop C Waiver legislation to give our homeless neighbors the help they desperately need,” co-CEOs of Salesforce Marc Benioff — who vigorously campaigned for the measure — and Keith Block said in a statement.

Postmates CEO Bastian Lehmann said in a statement that he believes “a new generation of tech leaders must step up, do our part, and be working partners, not sparring partners, with the City” on addressing homelessness.